heap.h

Go to the documentation of this file.

// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef INCLUDE_CPPGC_HEAP_H_
#define INCLUDE_CPPGC_HEAP_H_
 
#include <cstddef>
#include <cstdint>
#include <memory>
#include <vector>
 
#include "cppgc/common.h"
#include "cppgc/custom-space.h"
#include "cppgc/platform.h"
#include "v8config.h"  // NOLINT(build/include_directory)

namespace cppgc {
 
class AllocationHandle;
class HeapHandle;

namespace internal {
class Heap;
}  // namespace internal
 
class V8_EXPORT Heap {
 public:
  using StackState = EmbedderStackState;

  enum class StackSupport : uint8_t {
    kSupportsConservativeStackScan,
    kNoConservativeStackScan,
  };

  enum class MarkingType : uint8_t {
    kAtomic,
    kIncremental,
    kIncrementalAndConcurrent
  };

  enum class SweepingType : uint8_t {
    kAtomic,
    kIncremental,
    kIncrementalAndConcurrent
  };

  struct ResourceConstraints {
    size_t initial_heap_size_bytes = 0;
  };

  struct HeapOptions {
    static HeapOptions Default() { return {}; }

    std::vector<std::unique_ptr<CustomSpaceBase>> custom_spaces;

    StackSupport stack_support = StackSupport::kSupportsConservativeStackScan;

    MarkingType marking_support = MarkingType::kIncrementalAndConcurrent;

    SweepingType sweeping_support = SweepingType::kIncrementalAndConcurrent;

    ResourceConstraints resource_constraints;
  };

  static std::unique_ptr<Heap> Create(
      std::shared_ptr<Platform> platform,
      HeapOptions options = HeapOptions::Default());
 
  virtual ~Heap() = default;

  void ForceGarbageCollectionSlow(
      const char* source, const char* reason,
      StackState stack_state = StackState::kMayContainHeapPointers);

  AllocationHandle& GetAllocationHandle();

  HeapHandle& GetHeapHandle();
 
 private:
  Heap() = default;
 
  friend class internal::Heap;
};
 
}  // namespace cppgc
 
#endif  // INCLUDE_CPPGC_HEAP_H_